rewrite manual-link to rmake

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -72,7 +72,6 @@ run-make/lto-linkage-used-attr/Makefile
 run-make/lto-no-link-whole-rlib/Makefile
 run-make/lto-smoke-c/Makefile
 run-make/macos-deployment-target/Makefile
-run-make/manual-link/Makefile
 run-make/min-global-align/Makefile
 run-make/missing-crate-dependency/Makefile
 run-make/native-link-modifier-bundle/Makefile

tests/run-make/manual-link/Makefile

@@ -1,7 +0,0 @@
-# ignore-cross-compile
-include ../tools.mk
-
-all: $(TMPDIR)/libbar.a
-	$(RUSTC) foo.rs -lstatic=bar
-	$(RUSTC) main.rs
-	$(call RUN,main)

tests/run-make/manual-link/rmake.rs

@@ -0,0 +1,16 @@
+// A smoke test for the `-l` command line rustc flag, which manually links to the selected
+// library. Useful for native libraries, this is roughly equivalent to `#[link]` in Rust code.
+// If compilation succeeds, the flag successfully linked the native library.
+// See https://github.com/rust-lang/rust/pull/18470
+
+//@ ignore-cross-compile
+// Reason: the compiled binary is executed
+
+use run_make_support::{build_native_static_lib, run, rustc};
+
+fn main() {
+    build_native_static_lib("bar");
+    rustc().input("foo.rs").arg("-lstatic=bar").run();
+    rustc().input("main.rs").run();
+    run("main");
+}